Circumferentially traveling type tire mounting and demounting apparatus



Dec. 8, 1953 H. M. ROCKWELL 2,661,793

T CIRCUMFERENTIALLY TRAVELING TYPE TIRE MOUNTING AND DEMOUNTINGAPPARATUS 2 Sheets-Sheet 1 Filed July 2, 1947 INVENTOR flue H. ROCKWELLfiec. 8, 1953 H. M. ROCKWELL 2,661,793

CIRCUMFERENTIALLY TR LI TYP IRE MOUNTING AND DEMOU NG PAR s Filed July2, 1947 2 Sheets-Sheet 2 INVENTO HUGH M. ROCK L ATTORNEY Patented Dec.8, 1953 UNITED ST PATENT QEFICE CIRCUMFERENTIALLY TRAVELING TYPE TIREMOUNTING AND DEMOUNTING APPARATUS This invention relates to tiremounting and demounting machines of the type disclosed in my copendingapplication upon Tire Mounting and Demounting Machine of the Type HavingRelative Travel Between a Tire and a Tire Tool, Serial No. 633,698,filed December 8, 1945, now Patent No. 2,547,976, granted April 10,1951. The present invention is more particularly directed to improvedtool holding means and improved tire operating tools for use with suchmachines.

Machines of the stated type generally include a stand on which a rim, awheel or a disk wheel, with tire attached may be clamped, a rotatablecentral arbor threadedly engaged in a relatively fixed nut, a toolholder rotatable with the arbor, and a tire engaging tool on the holder.As the holder is rotated, it is drawn down by the threading of the arborinto its nut, this being a movement which causes the tool to follow ahelical path relative to the tire.

The tool is preferably engaged with the tire as near to a head of thetire as possible, so that the action of the tool on the tire loosens thebead from its seat. The required action involves means for quickly andeasily moving the tool laterally of the tire to place in under the wheelor rim flange. Also, as the pressure is concentrated fairly heavily onone incremental wall section of the tire, the tool should have a bearingsurface so designed as to exert pressure on the bead without risk ofcutting or breaking the tire wall. It is further desirable, from apractical standpoint, to construct these machines to handle differenttypes and sizes of wheels.

After the tire beads have been loosened, they must be pried over the rimflanges to remove the tire for inspection and repair. In practice, ithas can found that an on-off tool of diiierent design instead of merelya bead stripper tool performs this latter function with greaterfacility.

Such an on-off tool should also be capable of operating to pry off thelower tire bead without interference from the previously freed -upperbead. It is accordingly among the objects of this invention to provide atire mounting and demount- 13 Claims. (o1..i57 1;24).

.Anotherobject isto provide an improved bead stripper tool havinga'novel design of tire bearing surface providing for quick and easyinsertion oi'thetool'beneath the rim fiange while bearing directly onthe. bead, and also providing for av kneading action of the tire of sucha nature that the rubber actually flows around the tool bearing surface.

Still another object is to provide such a stripper tool whichautomatically eliminates any binding on the rim when the tool is movedradially or axially.

- A further object istoprovide a novel combination on-ofi tool forprying the loosened beads over the rim flange and including an off toefor removing the beads and an oif-set fon toe for replacing the beadsover the flange while permitting the tool tooperate on the lowerbeadwithout interference with the upper bead.

- A still further object is to provide such an onoii tool having an offtoe so oriented that it automatically' follows the tire bead and clearsthe rim flange as it is moved. into operative position.

These, and other objects advantages and novel features of the invention,will be apparent from .the following description-and the accompanying Isupport drivebar assembly embodying the presing machine of the describedtype includinga tool under pressure.

ent invention.

Fig. 2 is an elevation view of the stand, with a tire in section and rimor wheel thereon, and of the'drive bar and tool support assembly showinga stripper tool just prior to the beginning of a bead strippingoperation.

Fig. 3 is a plan view of an improved tool holding clamp forming part ofthe present invention,

with the tool shank. in section.

Fig. i'is a front elevation View, partly in sec- -tion, of the clampshown in Fig. 3.

T1011 to the ir in a ad ipping operation.

Fig. 8 is a vertical sectional view similar to Fig. 7 showing the toolofFigs. 5 and 6.

Fig. 9 is a vertical sectional view illustrating the action ofthe-toe-of the stripper tool on the Fig. is a perspective view of anon-off tool made according to the present invention.

Fig. 11 is an elevation view showing the onoff tool of Fig. 10 as usedin starting to lift a bead over a rim flange.

Fig. 1 2 isan elevation view showing the onoff tool; as used inreplacing the lower bead-cf a tire partly broken away over the rimflange.

Fig. 13 is an elevation view showing the onoff tool replacing the upperbead of a tire over the rim flange.

As stated, the present invention is directed to improvements in themachines of the type disclosed in the said patent granted on mycopending application, Serial No. 633,698. A machine substantiallysimilar, in basic construction and function, to the machine of mycopending application aforesaid is shown in Figs. 1, 2, 11, 12 and 13 ofthe drawings herein.

,Referring, more particularl'yrto these "figures,

the saidrmachine includes a wheel supporting basev or stand 15 and arotatable arbor which is threadable into and out of the interior of arelatively fixed nut or threaded sleeve secured axially in thestand 15.The stand I5 supports a tire mounted on a removablerim or a disk wheel35, as shown in Fig. 2, which issecured to the stand, inthe mannerdescribed in the said patent granted on my copen'ding applicationaforesaid, so that the wheel is held against rotation on the stand.

A drive bar and tool support assembly is mounted on the upper end ofarbor zlhand in- .cludes a tool support in a tool holder support 3| anda drive bar arrangement in the'form of a yoke 38 connected by a pin 39to a crank pin 32 for revolving a tool-secured'in a tool holding clampon the outer end of support 45. In Fig. 2, a bead stripper tool Elis-shown engaged in clamp v55, whereas in Figs. 11, 1-2 and 13 an.on-ofP'tool 10 is shown secured in the clamp.

The arrangement for moving the tool operates in the same manner asdescribed in the said patent granted on 'my oopending application.

Through eccentric means included in the assembly-40,-tool holder 45 isquickly adjustable laterally of tire 30 to bring the toe of tool 60beneath the flange of the wheel rim 35 and into engagement with theupper bead of'tire30. As

tool is revolved by drive bar arrangement 55!, tool 50 follows a helicalpath due to arbor '20 threading into the fixed nut or sleeve1'25. Toe

l35-exerts a kneading action-onthe upper bead,

loosening it from its rim seat. As the downward movement continues, thelower bead .is also loosened and tire 30drops off its rim 35.

If the rim is of thedropcenterstype, such as the wheel rim 35' of Figs.11, 12 and 13, the upper bead isi'lrst forced to drop into the dropcenter of the wheel. The'tire'and rim are then removed from. stand l5and again secured thereon inthe inverse position. The other bead is thenforced into the center well of the rim 35' in the same manner. Tool 60is then quickly disengaged from clamp 55 and "on-off tool 10 secured inthe clamp. A tire iron or the like-is used to pry up aportion of theupper tire bead and tool 10 is moved outwardly to engage its off toe l5under the bead. Drive bar assembly 59 is then swung counter-clockwise topull the remainder of the upper bead over the flange of rim 35'. The

same operation is repeated to my the lower bead over the rim flange.

In replacing a tire on its rim, tool '10 is reversed in position inclamp 55 so that its oil-set on iii) port 45, with the tool passing toone side of the arbor 211 and the lateral or radial adjustment of thetool in both directions relative to the drive bar 59 is effected bymovement of support 45. Clamp 55 is especially designed to hold the toolfirmly, when pressure is exerted thereon, while still permitting readyrelease of the tool for interchanging the same. Tool 60 is designed sothat it can be quickly engaged beneath the rim flange and aligned withthe bead. This is important, as the pressure should be exerted onthereinforced bead itself and not on the tire wall'beyond the bead, anymore than is necessary. A very desirable feature of tool '10 is. its

, readyinterchangeability in clamp 55 and its oil'- set on toe 38 whichenables the tool to clear an upper tire bead when operating on a lowerbead. All of these features, as well as important constructionaldetailswill now be described more in detail.

The base or stand [5, which is generally similar to'the tire supportingstand shown in the said patent granted on my said copendingapplicationabove referred to, comprises a base :5 suitably bolted to thefloor or other supporting sunface'and joined by column IT to a mountingplate It. This plate is provided with a series of threaded holes 59 forreceiving suitable clamping means to fasten a wheel or rim, such as adisc Wheel, on the stand, airplane wheels instead being held by frictionas in my copending application aforesaid. .IA diametric master line 2!is marked on the plate It which has holes 22 aligned therewith and whichare likewise threaded to receive clamping means for a wheel or rim. Theholes l9 and 22 are so distributed that practically any wheel or rim canbe placed on the stand I5 and secured thereto by suitable clamps, studsor the like as described in my cc- .erated by. handle 23. As this clampis completely shown and described in my patent aforesaid, it has notbeen believed necessary to illustrate the details thereof in the presentcase. It should be understood that any desired arrangement for lockingnut or sleeve 25 against rotation in stand (5 can be used, such as acollar clamp or other type of locking arrangement sufiicient to preventthe nut or sleeve from turning relative to stand 15.

The'drive bar and tool support assembly 4c is an important feature ofthe present invention and differs from that shown in my said copend-.ing application in that the tool holder 45 is offset from the axis ofarbor 28. This off-set arrangement provides greater facility inadjustment of the tool holder for operation on different size tires andrims. For this purpose, the tool holder, which is preferably rectangularin crosssection, slides through an elongated aperture in a tool holdersupport or clamp 3! which is rotatably mounted on a crank pin or boss32. Boss 32 is integral with a substantiallycircular plate 33 secured ineccentric relation to arbor 20. A locking pin 35 is mounted in the toolholder support SI, and may engage in any one of series of holes 35around the periphery of plate 33.

The drive bar arrangement 55 includes a socket 3'! having a forked end38 which is pivotally secured on a pin 39 extending through the crankpin or boss 32. Socket 3'! is arranged to receive any desired type ofdrive bar 55. Preferably, the drive bar comprises a tubular member andsocket 3'? is likewise tubular. I y

The arrangement so far described operates in substantially the samemanner as does the apparatus in my copending application aforesaid. Theeccentric arrangement including the plate 33 having the holes 35cooperable with the pin 3 on tool holder support 3! is substantiallyidentical in function with the previous arrangement, the only differencebeing that, in the present instance, the tool holder 45 is off-set fromarbor 25 so that it may be readily adjusted longitudinally through toolholder support 3! in either direction. To maintain the adjustment whenmade, a suitable wedge device is provided in tool holder support 5! andtightened by a stud, said device being indicated generally at 4! andconstructed like the wedging device for holding the tool hereinafterdescribed and shown in Figs.

3 and l.

For this purpose, the outer end of tool holder 35 carries toolsupporting bracket or clamp =55 in which the tire operating tools, suchas the stripper tool 59 and on-off tool 75, are interchangeablyreceivable. Bracket 55 is more clear- 1y shown in Figs. 3 and 4 ascomprising a pair of elongated jaws l2 and =33 with lateral recessesreceiving the shank of a tool, such as stripper tool 69. Jaw 53 has anoff-set boss M having an elongated aperture 45, the outer end of whichis threaded as at e'i. The inner portion of aperture it receives acylindrical wedge at, which has a flat surface adapted to bear againstthe shank of the tool and force the tool tightlyinto jaw 42. Wedge ithas a cylindrical T-head d9 engaged in a slot in a flanged head portion5i of a locking screw stud 52. Stud 52 is threaded into aperture 35, andis provided with a square head 53 for receiving a suitable wrench. Thescrew or stud 52 is freely rotatable with respect to wedge 43, and thewedge may be tightened or loosened by turning movement of stud 52. Thus,the tool is firmly clamped in the jaws d2, d5 of clamp 55.

The stripper tool 5%, which is an important feature of the presentinvention, is shown most clearly in Figs. 5 and 6. Tool 53 includes ashank portion 55' which is reduced in width, as at 57'. The reducedwidth portion 4'! enables the tool to be quickly engaged anddisengagedwith respect to tool clamp 55. This is made possible becausethe width of portion 41 is less than the lateral distance between thelips of jaws 42, 35. Consequently, the tool may be placed in the clampby placing the reduced width portion M through the lips of jaws 42, 43after which the tool is dropped down inside the jaws to the desiredposition. The width of the main portion of shank 35 is substantiallyequal to the width of the inner surfaces of jaws 42, 43 but such as topermit entry between said jaws 42, 43. Thus, only a slight tightening orloosening of wedge 48 is required to lock the tool in place or todisengage the tool.

In the operative position of tool 60, shank 45' is substantiallyperpendicular to the ground. However, in order that tool 60 will clearthe rim or wheel of a tire as it pushes the bead downwardly, the shankof the tool should preferably slant inwardly with relation to the tireand wheel, as shown in Fig. 2. Another way to provide clearance is touse the constructions shown in Figs. 5 and 6 wherein shank 45 iscontinued at its lower end into an angular portion 55 conn cting theshank to the toe 55 of the tool. The angularity of portion 56 is suchthat shank 45 will automatically free itself from contact with the wheelrim as the tool is moved downwardly as shown in Fig. 3.

On of the important features of tool 60 is the contour of toe 65. Itwill be noted that toe 65 has a transverse width substantially equal tothe width of the main part of shank 45', thus providing a longer surfaceto distribute the pressure on the tire bead. The upper surface "SI ofthe toe may be substantially fiat. The under surface is curved, andgenerally increasing in thickness from the leading edge 62 toward thetrailing edge 63. For example, a circumferential incline or obliquecurved surface 54 extends rearwardly and downwardly from leading edge 62and is joined by a substantially fiat or very slightly curved section 55to the more steeply curved surface 61 adiacent the trailing edge 63. Theunder surface of toe 65 is likewise curved transversely as will be clearfrom Fig. 5, and this surface may be slightly flattened, as at 68, Wherethe greatest bearing effect on the tire occurs and is then inclinedupwardly onthe outer surface of the toe, as shown inFigs. 5, '7 and 8.

As explained, in loosening the beads of a tire having a deflated innertube TI and mounted on a rim or disk wheel 35 secured on stand l5, tool50 is first lined up with'the edge of toe 55 Just outside the flange l3of the rim or disk wheel. The tool is then brought down into bearingengagement with the tire wall as close as possible to'fiange 13 withinslight neededclearance. Pin 34 is then withdrawn from a hole 35, whichfrees tool holder support 3! from plate 33. Drive bar 50 is then turnedand, due to the eccentric relation of boss or crank pin32 to arbor 2Q,tool support and tool are moved inwardly or outwardly relative to theaxial center of wheel 35 when the pin 34 is removed from the holes Thisaids in loosening the tire from the wheel If the drive bar is swung inone direction with the pin 34 disengaged, toe is forced beneath flangel3 and into engagement with the bead of the tire. Pin'34 is thenre-engaged in another hole 36 to hold the tool drawn in. Turning ofarbor 20 in its threaded sleeve 25 then effects relative movement oftool along tire 30, and toe 55 exerts a kneading action on the tire dueto the give of the rubber. As the tool is revolved, it is at the sametime moved downwardly due to the threading clockwise of arbor 20 intoits nut 25. This helical movement of the tool forces the upper bead ofthe tire to slide downwardly along rim or wheel 35.

The action of the toe 65 will be better understood with reference toFigs. 7, 8 and 9. Fig. '7 shows an ideal tool for getting in quicklyunderneath rim35 and over the wire core M of the bead of tire 30. Itwill be noted that, in this ideal tool, the inner surface 16 of tool 60in Fig. 7 is curved to closely follow the contour of rim. 35. The outersurface T1 of the tool Gil is sloped to follow the natural contour ofthe tire wall 18 as bead H is pushed downwardly. The shank. 48 of tool50 slopes outwardly and upwardly so that, as the tool forces the beaddownwardly, the shank automatically clears itself of any frictionalcontact with flange 73 of rim or wheel 35. This is important, as underthe stresses exerted on tool 60' there may be a tendency due to lostmotion in the machine for the tool to move inwardly slightly, whichwould cause the shank 45 to bind against flange '53. With the shanksloped outwardly, of course, no such binding can occur because thenecessary clearance is provided.

While the tool referred to as being shown in Fig. '7 is of an idealshape, for practical reasons, and to adapt the tool to different sizesand shapes of rims and wheels, the tool may be constructed as shown inFigs. 5, 6 and 8. As shown in Fig. 8, the angular portion joining toe E5to shank 48, while not fitting as closely to flange 73 as in the case ofshank 45', does enable the toe E5 to get in quickly beneath the flangeand over the bead carrying the wire core I l. The bent or angularsection 55 provides the necessary clearance with regard to the outsideof flange it to prevent binding.

Fig. 9 shows the action of the tool on the tire. Assuming that the toolis traveling in the direction indicated by the arrow, the curved leadingedge 62, joined by the sloping inclined or curved surface 64 to thelower portion 55, allows the rubber of the tire to flow smoothly beneathtoe G5. The action of the rubber under the pressure of toe BS resemblesthat of a fluid, and the rubber tends to flow up and around the trailingedge G3. As the tool moves to the left in Fig. 9, there is a continuousroll or give of the rubber beneath the toe 65 to providethe describedkneading action. The section of toe 65., having the described contours,is'muoh more eilective by reason thereof, in loosening the bead andeliminates danger of injury to the tire which sometimes occurred withprevious tools.

After the tire beads have been loosened as described, the on-off" tooll8, shown in Fig. 10, is used to pull the beads over the rim or wheelflanges. This tool comprises an intermediate shank portion 81 fittinginto the clamp 55 in the same manner as the shank 4d of stripper tool35, The off portion of the tool comprises a rounded tapered toe S2slanted at such an angle from shank ill that it automatically frees orclears itself from the flange 73' of wheel 35 as will be apparent fromFig. 11 when being moved counter clockwise. In other words, as toolholder 45 is moved outwardly, the vertical distance from the bottomsurface of toe 82 relative to wheel '12 is increased. The leading edge83 of toe 82 is of less depth than the trailing edge 84 and the uppersurface of the toe is rounded between its leading and trailing edges.

On the other end of shank BI is the on portion of the tool comprising ahorizontal intermediate section 85 and a toe portion 39 extendingsubstantially parallel to shank 8!. In this case, likewise, the tireengaging surface li'l is curved rearwardly from the relatively narrowleading edge 88 to the wider trailing edge 89. Both oil toe l5 and ontoe 80 are less in width than the lateral dimension between the lips ofjaws 42, 43 of clamp so that the tool it may be easily em gaged in anddisengaged from the tool holder support.

The action of tool 10 is best shown in Figs. 11, 12 and 13. Fig. 11shows the use of tool 10 to lift a bead over the flange 13' of wheel 35.As a first step, a tire iron or pry bar is used to push a portion of theupper bead 14 of the tire above flange 73'. Tool 10 is then movedoutwardly, through the use of the eccentric on the drive bar assembly,to engage toe l5 beneath bead 14 so that the inclined toe l5automatically clears itself from the wheel rim, when the tool 18 isrotated. Drive bar 50 is then swung counter-clockwise.

This pulls the rest of the bead 14 over the flange l3 and at the sametime lifts the bead. The thread on the arbor 20 is helpful in makingsure of maintaining clearance between the tool it and the rim 13'. Thesame action is repeated to pull the lower head 9! over flange 13'.

Fig. 13 shows the first step in replacing tire 30 on wheel 35'. Tool isreversed in clamp 55 so that the on toe portion 80 is in the lowerposition in the clamp 55. By outward movement of tool holder 55, thecurved tire engaging surface of toe 8B is engaged with the inside of thelower bead 9|. Drive bar 58 is then swung counter-clockwise and tool l0pushes bead .5! over flange 13. In this operation, the outer surface oftoe 89 is substantially aligned radially with the outer surface offlange 13'.

The upper bead E4 is then forced over flange E3 in the same manner. Toe80 is engaged with the bead, through adjustment of tool holder 35, tomove tool it outwardly, after which the drive bar is swungcounter-clockwise to move toe 80 along bead l4 and force the bead outbeyond flange '13.

The described invention provides a novel and very practical arrangementfor removing and replacing tires relative to their rims or wheels. Thefundamental portion of the apparatus operates on essentially the sameprinciple does that disclosed in my copending application referred toabove. However, the use of the off-set bracket for the tool holder 45permits ready adjustment of the tool holder radially oi the tire, thuseliminating the necessity for adjusting the tool itself along itsholder, as in my prior application.

The novel stripper tool arrangement, in cooperation with the bracket orclamp 55 permits ready insertion and adjustment of not only the strippertool 68 but also the on-off tool it in the bracket 55. This isaccomplished by the reduced width shank section ll of tool St and thereduced width toe portions '55, 23 of tool E5. The width of thesereduced portions is less than the lateral distance between the inneredges of. clamp jaws Q2, 43 thus permitting, in the case of tool til,the easy insertion of the tool into the clamp byholding the toolparallel with clamp face and moving it inwardly. This is of greatimportance where clearances may be limited, preventing tool 66 when inplace from being withdrawn vertically from clamp Likewise, therelatively narrow intermediate section 86 and the reduced width of thetoe of tool it, which are narrower than the distance between the jaws42, 63, permit this tool, which is shorter than tool 66, to be readilyinserted in clamp 55. As will be noted from Fig. 12, the oil-setarrangement of toe 86 provides for the shank 3| of the tool clearing theupper tire bead while the lower tire bead is being forced over the rimor wheel flange.

The inclined under surfaces of the toe 65 of tool 60 provides for aneasy kneading action at the toe, of the rubber of the tire and permitsthe rubber to flow past the toe as it moves along the bead. The curvedinner edge 92 of tee 55 provides for easy forcing of the toe radiallyinwardly between the flange of the rim or wheel and the head of thetire. The slanted intermediate shank section 56 effects automaticclearing of the tool from frictional contact with the rim or wheel asthe tool is moved downwardly.

The clamp 55 is likewise a very important feature of the invention. Thefrictional clamping effect afforded by the wedge (it permits of readyrelease of the tool even under pressure. Referring to Fig. 4, thepressure on the tool from the clamp is exerted downwardly, so that thereaction of the tool is upwardly. ihus, the greater the pressure, themore tightly wedge it grips the shank of the tool. However, the wedgemay be quickly released by turning of screw stud 52.

While specific embodiments of the invention have been shown anddescribed in detail to illustrate the application of the principlesthereof, it will be understood that the invention may be otherwiseembodied without departing from such principles.

What is claimed is:

1. In a tire mounting and demounting machine of the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from its carrier, and including a tiresupporting stand and an arbor extending axially of a tire thereon, arotatable bracket having a journal bearing secured to said arbor andhaving a substantially horizontal aperture extending therethroughtransversely of the tire, the aperture being spaced radially off centerfrom the journal bearing axis, and an elongated tool support slidablethrough the aperture at one side of the journal bearing and extendingtransversely of the tire.

2. In a tire mounting and demounting machine of the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from its carrier, and including a tiresupporting stand and an arbor extending axially of a tire thereon, arotatable bracket having a journal bearing secured to said arbor andhaving a substantially horizontal aperture extending therethroughtransversely of the tire, the aperture being spaced radially olf centerfrom the journal bearing axis, an elongated tool support slidablethrough the aperture at one side of the journal bearing and extendingtransversely of the tire, and means efiective to lock said support inadjusted position in the aperture.

3. In a tire mounting and demounting machine of the type in whichrelative revolution is efiected between a tire and a tool engagedtherewith to loosen the tire from its carrier, and including a tiresupporting stand and an arbor extending axially of a tire thereon, arotatable bracket having a journal bearing secur d to said arbor andhaving a substantially horizontal aperture extending therethroughtransversely of the tire, the aperture being spaced radially off centerfrom the journal bearing axis, an elongated tool support slidablethrough the aperture at one side of the journal bearing and extendingtransversely of the tire, and a tool holder secured together with theouter end of said support.

4:. In a tire mounting and demounting machine of the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from its carrier, the tool being held in asupport extending laterally of the tire relative to an arbor extendingaxially of the tire, a tool holder secured together with the outer endof said support, said holder having laterally spaced parallel jawsarranged to receive the shank of the tool, and releasable wedge means,including a wedge having an annular recess in a circular head and arecess-engaging head on a screw for moving the wedge forwardly andrearwardly, operatively associated with at least one of said jaws andeffective to frictionally grip the tool shank when the wedge has beenmoved forwardly.

5. In a tire mounting and demounting machin of the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from its carrier, the tool being held in asupport extending laterally of the tire relative to an arbor extendingaxially oi the tire, a tool holder secured together with the outer, endof said support, said holder having laterally spaced parallel jawsequipped with lateral recesses arranged to receive the shank of thetool, a tool securable in said clamp and having a shank portion of awidth approximately that of the lateral spacing of the bottom of therecesses and a shank portion of less width than the lateral spacing ofsaid jaws, whereby said tool may be readily disengaged from said clamprecesses by aligning said section with said jaws, and releasableclamping means operatively associated with at least one of said jaws andeffective to frictionally grip the tool shank.

6. In a tire mounting and demounting machine 0f the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from its carrier, the tool being held in asupport extending laterally of the tire relative to an arbor extendingaxially of the tire, a tool holder secured together with the outer endof said support, said holder having laterally spaced parallel jawsarranged to receive the shank of the tool, a wedge having an annularrecess in a circular head movable along the inner surface of one jaw,and screw means, having a head engaging said recess, rotatably securedfor movement with said wedge to adjust the same longitudinally of thejaw forwardly and rearwardly to frictionally grip the tool shank whenthe wedge has been moved forwardly."

'7. In a tire mounting and demounting machine of the type in whichrelative revolution iseffected between a tire and a tool engagedtherewith to loosen the tire from its carrier, the tool being held in asupport extending laterally of the tire relative to an arbor extendingaxially of the tire, a tool holder secured together with the outer endof said support, said holder having laterally spaced parallel jawsarranged to receive the shank of the tool, a wedge having an annularrecess in a circular head movable along the inner surface of one jaw,and screw means, having a head engaging said recess, rotatably anddetachably secured for movement forwardly and rearwardly with said wedgeto adjust the same longitudinally of the law to frictionally grip thetool shank when the wedge has been moved forwardly.

8. In a tire mounting and demounting machine of the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from its carrier, the tool being held in asupport extending laterally of the tire relative to an arbor extendingaxially of the tire, a tool holder secured together with the outer endof said support, said holder having laterally spaced parallel jawsequipped with lateral recesses arranged to receive the shank of thetool, a tool securable in said clamp and having a shank portion of awidth approximately that of the lateral spacing of the bottom of therecesses and a shank portion of less width than the lateral spacing ofsaid jaws, whereby said tool may be readily disengaged from said clamprecesses by aligning said section with said jaws.

9. In a tire mounting and demounting machine or the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from a wheel rim having a flange, a beadstripper tool including a shank arranged to be received in a toolholder, a substantially horizontal toe, having less depth than such aflange, projecting laterally relative to said shank for engagement witha tire bead and a portion oblique to and interconnecting said toe andshank-whereby, as said tool is moved axially relative to the tire, saidshank will be free from binding with regard to the said flange.

10. In a tire mounting and demounting machine of the type in whichrelative revolution is efiected between a tire and a tool engagedtherewith to loosen the tire from a wheel rim havin a flange, a beadstripper tool including a shank arranged to be received in a tool holderand a substantially horizontal toe projecting laterally relative to saidshank for engagement with a tire head, said toe having an undersurfacefor en gagement with the tire characterized by a circumferentiallyinclined surface extending rearwardly from the leading edge of the toe,and a relatively steeper inclined surface extending forwardly from thetrailing end of the toe.

11. In a tire mounting and demounting machine of the type in whichrelative revolution is effected between a tire and a tool engagedtherewith to loosen the tire from its carrier, and including means foradjusting the tool radially of the tire, a tool for prying a tire headover a flange on the carrier including a shank extending substantiallyparallel to the tire axis and a toe projecting radially outwardly fromthe shank to engage beneath a tire bead and pry it over the flange, thelower surface of said toe slanting upwardly toward the tire axiswhereby, as the tool is adjusted radially outwardly, said toe willautomatically clear the tire carrier.

12, In a tire mounting and demounting machine of the type in whichrelative revolution is efiected between a tire and a tool engagedtherewith to loosen the tire from its carrier, and including means foradjusting the tool radially of the tire, a tool for prying a tire headover a flange on the carrier including a shank extending substantiallyparallel to the tire axis, a first toe projecting radially outwardlyfrom one end of the shank, the lower surface of said toe slantingupwardly toward the tire axis whereby, a the tool is adjusted radiallyoutwardly, said toe will automatically clear the tire carrier, anofi-set portion extending oppositely to said first toe from the oppositeend of the shank and a second toe extending from said ofi-set portionsubstantially parallel to the shank and having a curved outer surfacearranged to engage the radially inner surface of a tire bead to forcethe bead outwardly over the carrier flange, said oiT-set portionpreventing interference between the upper bead of a tire and the toolwhen remounting the lower tire bead.

13. A bead stripper tool for stripping a tire from a wheel rim,including a shank arranged to be received in a tool holder, having a toeprojecting laterally relative to said shank for engagement with the tirebead, with an outer face oblique to and interconnecting said toe andshank, said shank being located in a position unobstructed by the wheelrim in stripping the tire from the rim and having a reduced widthportion adjacent the toe enabling the tool to be quickly engaged anddisengaged.

' HUGH MONROE ROCKWELL.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 945,675 Barnes Jan. 4, 1910 1,341,727 Weaver T June 1, 19201,385,948 Norlund July '26, 1921 1,402,471 Beck Jan. 3, 1922 1,452,596Fernelmont Apr. 24, 1923 1,646,511 Weaver et a1. Oct. 25 1927 1,742,599Freivogel Jan. 7, 1930 1,793,864 Manley Feb. 24, 1931 2,201,982 BazarekMay 28, 1940 2,418,849 Polt Apr. 15 1947 2,421,856 Teegarden June 10,1947 FOREIGN PATENTS Number Country Date 765,192 France Mar. 19, 1934

